Fore/aft position

[OakLeaf]

Offset might well be your issue, but check seat height first. If your saddle is too low, then your knees will be over-flexed at any given position. The general rule is that at the bottom of the pedal stroke, you should just be able to put your shod heel on the center of your pedal with your knee extended but not locked. If you've already done this and I missed it in another thread ... then offset is probably it, and sorry for the repeat

ETA - just reread your OP and saw where you're not having problems. My first rule is if it ain't broke, don't fix it. It can be enlightening to play around and experiment with fit just for greater comfort and power, but if you're on a tight budget, I don't think I'd necessarily shell out for a new seatpost just to see. If you have a local swapmeet or find something on TE for not too much money it could be worth a try, but other than that...

The other thing is cleat position. Are they directly under the ball of your foot?